全文获取类型
收费全文 | 31726篇 |
免费 | 2011篇 |
国内免费 | 191篇 |
专业分类
耳鼻咽喉 | 383篇 |
儿科学 | 675篇 |
妇产科学 | 712篇 |
基础医学 | 3887篇 |
口腔科学 | 955篇 |
临床医学 | 2584篇 |
内科学 | 8114篇 |
皮肤病学 | 698篇 |
神经病学 | 3130篇 |
特种医学 | 1004篇 |
外科学 | 4830篇 |
综合类 | 139篇 |
一般理论 | 11篇 |
预防医学 | 1709篇 |
眼科学 | 475篇 |
药学 | 2122篇 |
1篇 | |
中国医学 | 64篇 |
肿瘤学 | 2435篇 |
出版年
2023年 | 210篇 |
2022年 | 440篇 |
2021年 | 874篇 |
2020年 | 523篇 |
2019年 | 772篇 |
2018年 | 912篇 |
2017年 | 686篇 |
2016年 | 769篇 |
2015年 | 824篇 |
2014年 | 1228篇 |
2013年 | 1520篇 |
2012年 | 2299篇 |
2011年 | 2316篇 |
2010年 | 1386篇 |
2009年 | 1233篇 |
2008年 | 2059篇 |
2007年 | 1983篇 |
2006年 | 1911篇 |
2005年 | 1857篇 |
2004年 | 1689篇 |
2003年 | 1597篇 |
2002年 | 1411篇 |
2001年 | 422篇 |
2000年 | 414篇 |
1999年 | 415篇 |
1998年 | 262篇 |
1997年 | 260篇 |
1996年 | 247篇 |
1995年 | 219篇 |
1994年 | 198篇 |
1993年 | 172篇 |
1992年 | 283篇 |
1991年 | 210篇 |
1990年 | 222篇 |
1989年 | 225篇 |
1988年 | 191篇 |
1987年 | 194篇 |
1986年 | 164篇 |
1985年 | 170篇 |
1984年 | 129篇 |
1983年 | 131篇 |
1982年 | 91篇 |
1981年 | 85篇 |
1980年 | 76篇 |
1979年 | 64篇 |
1978年 | 77篇 |
1977年 | 47篇 |
1976年 | 46篇 |
1972年 | 32篇 |
1971年 | 30篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Juan D. Gonzalez‐Sanz 《Nursing philosophy》2020,21(4)
The current situation in which the humanities are disparaged affects all university disciplines, including nursing, in whose historical evolution the humanities have always been present in one form or another. Looking beyond this disrepute, this study proposes that nursing renew its attention to classical philosophy. Specifically, it invites a close reading of Xenophon's Anabasis and Plato's Meno, to get three related goals: to show how the use of ancient texts are very valuable tools for the philosophical initiation of nursing students and can help them reflect on their choice of nursing as a practical activity; to reflect on the problem of virtue and the nature of the good life; and to show how the interaction with ancient texts allows students to reflect on questions and issues of life, theirs and others, that are not open to investigation through a purely scientific method. Consequently, both Anabasis and Meno readings strengthen the intellectual relationship between philosophy and nursing, enabling the latter to delve deeper into the key questions of its own thought as a discipline. 相似文献
2.
Cost‐Effectiveness and Cost‐Utility Analysis of Spinal Cord Stimulation in Patients With Failed Back Surgery Syndrome: Results From the PRECISE Study 下载免费PDF全文
Furio Zucco MD Roberta Ciampichini MSc Angelo Lavano MD Amedeo Costantini MD Marisa De Rose MD Paolo Poli MD Gianpaolo Fortini MD Laura Demartini MD Enrico De Simone MD Valentino Menardo MD Piero Cisotto MD Mario Meglio MD Luciana Scalone PhD Lorenzo G. Mantovani DSc 《Neuromodulation》2015,18(4):266-276
3.
4.
5.
6.
John Lennon Silva Cunha Amanda Almeida Leite Thamiris de Castro Abrantes Lorena Passoni Vervloet Thayn Melo de Lima Morais Gerson de Oliveira Paiva Neto Tatiana Nayara Librio Kimura Snia Maria Soares Ferreira Ricardo Luiz Cavalcanti de Albuquerque‐Júnior Aline Corrêa Abraho Mario Jos Romaach Bruno Augusto Benevenuto de Andrade Oslei Paes de Almeida Ciro Dantas Soares 《Journal of cutaneous pathology》2021,48(1):24-33
7.
Marlen Z. Gonzalez Lane Beckes Joanna Chango Joseph P. Allen James A. Coan 《Social cognitive and affective neuroscience》2015,10(7):921-928
Neuroimaging studies using the social-exclusion paradigm Cyberball indicate increased dorsal anterior cingulate cortex (dACC) and right insula activity as a function of exclusion. However, comparatively less work has been done on how social status factors may moderate this finding. This study used the Cyberball paradigm with 85 (45 females) socio-economically diverse participants from a larger longitudinal sample. We tested whether neighborhood quality during adolescence would predict subsequent neural responding to social exclusion in young adulthood. Given previous behavioral studies indicating greater social vigilance and negative evaluation as a function of lower status, we expected that lower adolescent neighborhood quality would predict greater dACC activity during exclusion at young adulthood. Our findings indicate that young adults who lived in low-quality neighborhoods in adolescence showed greater dACC activity to social exclusion than those who lived in higher quality neighborhoods. Lower neighborhood quality also predicted greater prefrontal activation in the superior frontal gyrus, dorsal medial prefrontal cortex and the middle frontal gyrus, possibly indicating greater regulatory effort. Finally, this effect was not driven by subsequent ratings of distress during exclusion. In sum, adolescent neighborhood quality appears to potentiate neural responses to social exclusion in young adulthood, effects that are independent of felt distress. 相似文献
8.
9.
Heidi J Kalkwarf John A Shepherd Didier Hans Elena Gonzalez Rodriguez Joseph M Kindler Joan M Lappe Sharon Oberfield Karen K Winer Babette S Zemel 《Journal of bone and mineral research》2022,37(4):776-785
Trabecular bone score (TBS) is used for fracture prediction in adults, but its utility in children is limited by absence of appropriate reference values. We aimed to develop reference ranges for TBS by age, sex, and population ancestry for youth ages 5 to 20 years. We also investigated the association between height, body mass index (BMI), and TBS, agreement between TBS and lumbar spine areal bone mineral density (aBMD) and bone mineral apparent density (BMAD) Z-scores, tracking of TBS Z-scores over time, and precision of TBS measurements. We performed secondary analysis of spine dual-energy X-ray absorptiometry (DXA) scans from the Bone Mineral Density in Childhood Study (BMDCS), a mixed longitudinal cohort of healthy children (n = 2014) evaluated at five US centers. TBS was derived using a dedicated TBS algorithm accounting for tissue thickness rather than BMI. TBS increased only during ages corresponding to pubertal development with an earlier increase in females than males. There were no differences in TBS between African Americans and non-African Americans. We provide sex-specific TBS reference ranges and LMS values for calculation of TBS Z-scores by age and means and SD for calculation of Z-scores by pubertal stage. TBS Z-scores were positively associated with height Z-scores at some ages. TBS Z-scores explained only 27% and 17% of the variance of spine aBMD and BMAD Z-scores. Tracking of TBS Z-scores over 6 years was lower (r = 0.47) than for aBMD or BMAD Z-scores (r = 0.74 to 0.79), and precision error of TBS (2.87%) was greater than for aBMD (0.85%) and BMAD (1.22%). In sum, TBS Z-scores provide information distinct from spine aBMD and BMAD Z-scores. Our robust reference ranges for TBS in a well-characterized pediatric cohort and precision error estimates provide essential tools for clinical assessment using TBS and determination of its value in predicting bone fragility in childhood and adolescence. © 2022 American Society for Bone and Mineral Research (ASBMR). 相似文献
10.
Jos M. Martín Encarnacion Montesinos Pilar Cordero Victor Gonzalez Dolores Ramon 《Pediatric dermatology》2019,36(2):265-267
Trichotillomania is a form of traction alopecia resulting from repetitive and compulsive hair pulling and plucking. Trichotillomania and patchy alopecia areata may have similar clinical and dermoscopic features in some cases. On trichoscopic examination, the presence of black dots, coiled or hook hair, shafts of varying lengths with fraying or split ends (trichoptilosis), and an absence of exclamation mark hairs and yellow dots are suggestive of trichotillomania. 相似文献